qt实现登录 

#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //    去掉头部
    this->setWindowFlag(Qt::FramelessWindowHint);
    //    去掉空白部分
    this->setAttribute(Qt::WA_TranslucentBackground);
    ui->lineEdit_2->setClearButtonEnabled(true);
 
};
 
Widget::~Widget()
{
    delete ui;
}
 
 
void Widget::on_pushButton_clicked()
{
    QMessageBox box;
    //设置文本框的大小
  
    if(ui->lineEdit->text() == "admin") {
        if( ui->lineEdit_2->text() == "123456" ){
         int ret = QMessageBox::information(this,"提示","登录成功",QMessageBox::Ok| QMessageBox::No);
         if(ret == QMessageBox::Ok){
             //登录界面关闭跳转下一个界面
            emit my_jump_login();
         }  
        }else{
           QMessageBox::information(this,"提示","登录失败",QMessageBox::Ok);
        }
    }else{
     QMessageBox::information(this,"提示","登录失败",QMessageBox::Ok);
    }
}
 
void Widget::on_pushButton_2_clicked()
{
    this->close();
}
 
void Widget::on_pushButton_3_clicked()
{
    this->showMinimized();
}

使用定时器事件 实现闹钟

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    id = startTimer(1000);

}

//重写定时器事件函数的实现
void Widget::timerEvent(QTimerEvent *e){
    if(e->timerId() == id){
        QTime sys = QTime::currentTime();
        QString time = sys.toString("hh:mm:ss");
        ui->sys_time->setText(time);
    }
}



Widget::~Widget()
{
    delete ui;
}


void Widget::on_start_btn_clicked()
{
    qDebug() <<  ui->alarm_time->text();
    speecher = new QTextToSpeech(this);
    if(  ui->sys_time->text() ==  ui->voice_label->text() ){
        speecher->say(ui->voice_label->text());
    }
    qDebug() << "label" << ui->voice_label->text();
    qDebug() << ">sys_time->text:" << ui->sys_time->text();

}